The use methods of different plastic extruders are generally different, but the normal shutdown operation is similar. As an enterprise with many years of experience in related equipment, Qingdao Trusty Plastic Machinery Co., Ltd. simply collates a document about the normal shutdown sequence of conventional twin-screw plastic extruder, as follows:
1. First of all, we need to stop feeding the plastic extruder. The conventional twin-screw plastic extruder has a feeder or feeding system. If a multi-channel feeding system is used, it is necessary to stop all auxiliary feeders at this time.
2. If the extruder has a vacuum pumping system, we need to close the valve of the vacuum pipeline and then open the upper cover plate of the vacuum chamber.
3. The screw of the extruder cannot stop rotating directly. Instead, the screw speed should be gradually reduced and the residual materials in the barrel should be discharged as much as possible. If the extruder uses heat-sensitive materials that are easily decomposed by heating as raw materials, polyolefin materials shall be used to replace the residual materials in the main extruder before the shutdown, and the twin-screw main extruder can be stopped only after the materials are basically discharged. If the extruder production line adopts a two-stage unit, it is necessary to stop the first stage extruder first, and then stop the second section of extruder equipment.
4. Stop the main motor cooling fan, oil pump, vacuum pump, and water pump in turn. Disconnect the heater power switch of each section on the electric instrument control cabinet.
5. Stop pelletizer and other auxiliary equipment
6. Close the valves of all external water pipes, including the cooling water of the barrel in the feeding section, the cooling water of the oil lubrication system, vacuum pump, the cooling water of the water tank, etc.(the throttle valves of each soft water cooling pipeline of the main barrel do not move)
The above is the information prepared by the author for you. I hope to provide you with some help. If you have more needs, you are welcome to call for details or come to the factory for an on-site investigation. We will provide you with professional technical guidance and equipment procurement suggestions.